diff --git a/Section4/untyped_constants/main.go b/Section4/untyped_constants/main.go
index 7905807..136c25c 100644
--- a/Section4/untyped_constants/main.go
+++ b/Section4/untyped_constants/main.go
@@ -1,5 +1,29 @@
 package main
 
-func main() {
+import "fmt"
 
+func main() {
+	const a float64 = 5.1
+
+	const b = 6.2 //untyped constant
+
+	const c float64 = a * b
+	const str = "Hello " + "Go!"
+
+	const d = 5 > 10
+	fmt.Println(d)
+
+	const x = 5
+	const y = 2.2 * 5
+	fmt.Printf("%T\n", y)
+
+	var i int = x
+	var j float64 = x
+	var p byte = x
+	fmt.Println(i, j, p)
+	fmt.Printf("%T\n", p)
+
+	const r = 5
+	var rr = r
+	fmt.Printf("%T\n", rr)
 }